Hi Tim,
Now I'm getting a bit puzzled !
Cheers,
Jorma
From: psn-l-request@.............. [mailto:psn-l-request@webtroni=
cs.com] On Behalf Of Timothy Carpenter
Sent: 05 February 2005 21:33
To: psn-l@..............
Subject: RE: Iris Waveform Chart
I should probably know =96 but I don't. What is the "caustic" dis=
tance? And for that matter, what is the "caustic"?
Regards,
-Tim-
Timothy Carpenter, P.E., Pres.,
GeoDynamics Consultants, Inc.
5043 Whitlow Ct.
Commerce Twp., Mi 48382
248-363-4529 (voice & fax)
248-766-1629 (cell)
geodynamics@........... (primary)
geodynamics@....... (secondary)
-----Original Message-----
From: psn-l-request@.............. [mailto:psn-l-request@webtroni=
cs.com] On Behalf Of Connie and Jim Lehman
Sent: Sunday, January 09, 2005 7:03 PM
To: psn-l@..............
Subject: Iris Waveform Chart
PSN--thanks for the Iris Waveform Chart for the 9.0 Sumatra 12/2=
6/04 event. The surface wave arrivals of multiple stations exhib=
ited by distance, and text, makes a super graphic. I was wonder=
ing about the occurrence of a seismic caustic at the appropriate=
degree distance. Was the gap at 160 degree area due to no repor=
ting station near the "caustic" distance. In periodic recording=20=
here we've copied three caustics in 20 years--I believe the even=
ts were southwest of Australia for us--not a very hot spot.
The 18 sec long period system at James Madison Un. (Virginia=
) working into a graphic readout read the 8.1 Macquarie Is. event=
-(l2/23) nicely, but the 9.0 event read 20 min after P-diff arriv=
ed and then went off scale for 100 minutes and returned to normal=
recording for the 7.1 event at 04:21. One can conclude, surface=
wave arrivals for us (at approx. 145 degrees) were obscured. Ke=
ep up the good work.
Hi Tim,
Now I'm getting a bit puzzled !
Cheers,
Jorma
From: psn-l-request@webtronic=
s.com
[mailto:psn-l-request@............... On Behalf Of Timothy=
Carpenter
Sent: 05 February 2005 21:33
To:
psn-l@..............
Subject: RE: Iris Waveform
Chart
I shou=
ld probably know
– but I don't. What is the "caustic" distance? And for that=
matter, what is the
"caustic"?
Regard=
s,
-Tim-
Timothy Carpenter, P.E., Pres.,
GeoDyn=
amics Consultants,
Inc.
5043 Whitlow Ct.
Commerce Twp., Mi 48382
248-363-45=
29 (voice &
fax)
248-766-1629 (cell)
geodynamics@...........
(primary)
geodynamics@a=
tt.net
(secondary)
-----Original
Message-----
From:=
psn-l-request@.............. [mailto:psn-l-request@...............
] On Behalf Of Connie and Ji=
m
Lehman
Sent: S=
unday, January
09, 2005 7:03 PM
To:
psn-l@..............
Subj=
ect:
Iris Waveform Chart
=
PSN-=
-thanks for the
Iris Waveform Chart for the 9.0 Sumatra 12/26/04 event.&nbs=
p; The surface
wave arrivals of multiple stations exhibited by distance, and tex=
t, makes
a super graphic. I was wondering about the occurrence=
of a seismic
caustic at the appropriate degree distance. Was the gap at=20=
160 degree area
due to no reporting station near the "caustic" distance. In=
periodic
recording here we've copied three caustics in 20 years--I b=
elieve the
events were southwest of Australia for us--not a very hot
spot.
&nbs=
p; The
18 sec long period system at James Madison Un. (Virginia) w=
orking into a
graphic readout read the 8.1 Macquarie Is. event-(l2/23) nicely,=20=
but the 9.0
event read 20 min after P-diff arrived and then went off scale fo=
r 100 minutes
and returned to normal recording for the 7.1 event at 04:21. =
; One can
conclude, surface wave arrivals for us (at approx. 145 degre=
es) were
obscured. Keep up the good work. =
&=
nbsp;
Jim Lehman
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